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EQUILIBRIUM OF A PARTICLE for the second particle.   It follows from these equations that
Ti = r2 w
2 sin
Z
:W.
Fio. 16.
DISCUSSION.  The tensile force of the strings increases indefinitely as their total length approaches that of the bar. On the other hand as the length of the strings becomes very large compared with that of the
IV
bar the tensile force approaches -^ as a limit.
2t
The problem can be solved also by considering the forces acting on the peg, as shown in Fig. 16b.
PROBLEMS.
1.   Show that when a particle is in equilibrium under the action of two forces the forces must lie in the same straight line.
2.   Show that when a particle is in equilibrium under the action of three forces the forces lie in the same plane.